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The characteristics of Seyfert galaxies were first observed in M77 in 1908; however, Seyferts were defined as a class in 1943. [23] First radio galaxy: Cygnus A: Cygnus: 1951 Of several items, then called radio stars, Cygnus A was identified with a distant galaxy, being the first of many radio stars to become a radio galaxy. [24] [25] First ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 16 February 2025. Hypothetical group of multiple universes Not to be confused with Metaverse. "Multiverses" redirects here. Not to be confused with MultiVersus. For other uses, see Multiverse (disambiguation). Part of a series on Physical cosmology Big Bang · Universe Age of the universe Chronology of ...
The physical universe is defined as all of space and time [a] (collectively referred to as spacetime) and their contents. [10] Such contents comprise all of energy in its various forms, including electromagnetic radiation and matter, and therefore planets, moons, stars, galaxies, and the contents of intergalactic space.
The Hubble eXtreme Deep Field (XDF) was completed in September 2012 and shows the farthest galaxies ever photographed at that time. Except for the few stars in the foreground (which are bright and easily recognizable because only they have diffraction spikes), every speck of light in the photo is an individual galaxy, some of them as old as 13.2 billion years; the observable universe is ...
Sevolite super-pilots adept at Reality Skimming (FTL travel) work out cultural differences with technically sophisticated Reetions and associated canon by collaborators also set in the Okal Rel Universe. [2] Old Man's War Universe: Old Man's War: 2005 John Scalzi: Opening of the World: Beyond the Gap: 2007 Harry Turtledove: Osten Ard: The ...
The setting for The Name of the Wind and The Wise Man's Fear. The Name of the Wind: 2007: N Tékumel: M. A. R. Barker: A technological world is suddenly cast into a "pocket dimension". Reversing the usual sequence of events, Barker spent decades building his elaborate, detailed world before designing the initial tabletop role-playing game.
Tod R. Lauer (1957–) catalogued massive black holes at galaxy centers and correlated their mass with other properties of the galaxies' structures; Georges Henri Lemaître (1894–1966) proposed the big bang theory and the distance-redshift relation; Janna Levin (1967–) seeks evidence for a bounded universe of nontrivial topology
Illustration of the analogy between the human body and a geocentric cosmos: the head is analogous to the cœlum empyreum, closest to the divine light of God; the chest to the cœlum æthereum, occupied by the classical planets (wherein the heart is analogous to the sun); the abdomen to the cœlum elementare; the legs to the dark earthy mass (molis terreæ) which supports this universe.